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The Aya proof assistant

There is a newer version: 0.34.0

// Copyright (c) 2020-2023 Tesla (Yinsen) Zhang.
// Use of this source code is governed by the MIT license that can be found in the LICENSE.md file.
package org.aya.util;

import org.jetbrains.annotations.NotNull;

import java.util.function.Function;
import java.util.function.UnaryOperator;

/**
 * @param  the type of expressions.
 *            In Aya, it is either core term, core pattern, concrete term, or concrete pattern.
 */
public record Arg(@Override @NotNull T term, @Override boolean explicit) implements BinOpElem {
  public static  @NotNull Arg ofExplicitly(@NotNull T term) {
    return new Arg<>(term, true);
  }

  public static  @NotNull Arg ofImplicitly(@NotNull T term) {
    return new Arg<>(term, false);
  }

  public @NotNull Arg implicitify() {
    return new Arg<>(term, false);
  }

  public  @NotNull Arg map(@NotNull Function mapper) {
    return new Arg<>(mapper.apply(term), explicit);
  }

  public @NotNull Arg update(@NotNull T term) {
    return term == term() ? this : new Arg<>(term, explicit);
  }

  public @NotNull Arg descent(@NotNull UnaryOperator<@NotNull T> f) {
    return update(f.apply(term));
  }
}